Grinding machine



A. D. MYIZZY Sept. I9, 1944.

GRINDING MACHINE Filed'June 2., 1942 FIG.2.I

INVENTOR ALBERTQM/ZZY ATTORNE Patented Sept. 19, 19 44 2,358,584. GRINDING MACHINE Albert D. Mizzy. New York, :N. Y Eleanor Mizzy, New York,

. OF FlC-E assignor to N. Y!

Application June 2, 1942, Serial No. 445,417

This invention relates to grinding machines, and more specifically to a machine for grinding the tips of hypodermic injection'needles or similar objects. The invention has for its principal object the massgrinding of such objects as a constant, continuous process. I

To accomplish the above result there is provided a holder for the needles which is designedto be automatically closed after the needle is in holding position and automatically released to permit withdrawal ofthe needle when the grinding operation is completed and to permit reception of an unground needle.

.It is a further objectof this invention to provide a grinding machine for hypodermic injection needles in which the bevel on the needle tip will be determined independently of the operator and will therefore be uniform for all needles.

Still another-object of this invention is to provide a grinding machine wherebyneedles of different lengths maybe ground chine.

Further objects and advantages of this invention will become apparent in the following description thereof.

In the accompanying drawing,

. Fig. 1 is a plan viewof a modified form of my invention.

Fig.2 :is a section taken substantially on the line 22 of Fig. 1. s

Fig. 3 is a section line 3 3 of Fig.2.

Fig. 4 is a section taken substantially on the line 4-4 of Fig. 3.

In the form of this invention disclosed in Figs. 1 to 4 inclusive, there is shown a machine which is adapted for the grinding of needles of various lengths. In this form, the stop whichdetermines the projection of the needle point through the chuck arm is not the head of the needle, since this would mean that needles of various lengths would project different distances through the chuck arm. Instead, the stop is positioned at the forward end of the needle and adaptedto engage the point of the needle at a. fixed distance of projection beyond the chuck arm. Thus needles of different lengths would have their tips at a constant point relative to the chuck arm but would extend rearwardly to varying distances. For this purpose, the turret T' carries a plurality of chucks H, positioned around the periphery thereof, and having a spring-pressed plunger 50 adapted to engage a fixed cam A which presses theplunger outwardly, in this case, against the action of spring 5|, to move the perforation 52 taken substantially on the in the same mav with cam A.

1 stop and therefore is 4 Claims. (Cl. 51-134) 7 extending "through thepplunger away from the end of chuck arm 53. This releases thepressure on any needle which is in position within the perforation 52 and permits the needle to be withdrawn or inserted. When the plunger head 55 moves out of engagement with cam A, the compression spring which is positioned between the chuck arm and the piston head pushes thepiston inwardly to bring the needle firmly against the end of chuck arm 53 and thus cause the needle to be held firmly within perforation 52.

- To permit needles of different lengths to be ground, there is provided a stop member 60 designed to project into the when it is in position within perforation 52, so that the tip of the needle can extend no further than the stop 60. Thus, no matter how long the needle may be, it will project forwardly through the perforation 52 a constant distance, while the needles will extend rearwardly to various distances, depending upon their length. The stop 60 is pivotally mounted at 62 on the turret T and is in lowered position throughout the interval that the plunger head 55 is in engagement It is during this interval that the ground needle is withdrawn and an unground needle'is inserted in position. The unground needle is inserted in position, this position being the one Where the needle point has reached the projecting through perforation 52. for a constant distance irrespective of its length; The stop 60 is effective throughout the period that plunger head 55 engages cam A and for the distance beyond that point during which the plunger 50 has moved inwardly to grip the needle firmly against the end of chuck arm 53. It is now no longer necessary to have the stop 60 in position, because the needle is firmly held with its point projecting at a fixed distance through the perforation 52, and, moreover, the stop must 'be moved out of the way before the needle reaches the grinding wheel surface so that the needle tip may be ground. Therefore, just before the I needle reaches the grinding wheel, a fixed cam is provided which engages stop 60 to lift said stop around its pivot 62 out of engagement with the tip of the needle to the dotted line position shown in Fig. 7. Thus, while the needle is traversing the grinding wheel G, the stop is in ineffective position, but when,

the needle has passed beyond the grinding Wheel, in other words, when the grinding operation is completed, the stop again drops to its lowered position because projection H rides off the cam path of the needle 3l' under a projection H of the I and the stop is now in effective position so that when the head 55 of plunger 50 engages cam A to move the plunger 50 outwardly and thus release the needle, the needle will :be held in its position and will not drop further through the perforation.

In accordance with the provisions of the patent statutes, I have herein described the principle and operation of my invention, together with the apparatus whichInow consider to represent the best embodiment thereof, but I desire to have it understood that the apparatus shown is only illustrative and that the invention can be carried out by other equivalent means. while it is designed to use the various features and elements in the combination and relations described, some of these may be altered and others omitted without interfering with the more general results outlined, and the invention extends to such use.

Having described my invention, what I claim and desire to secure by Letters Patent is:

1. A grinding machine for hypodermic needles and the like, comprising a rotatable turret, a holder carried by said turret for holding the needle to be ground, said holder having means for releasably holdin the needle, a grinding element, means whereby said 'holder supports needles of various lengths withtheends to be ground in constant relation to the grinding element, said means comprising a pivoted stop in predetermined relation to said holder and adapted to engage the end of the needle to be ground, and means including a cam adapted to engage said stop to move the same out of engagement with the end of the needle to be ground while the needle is incooperative relationto said grinding element and to release said stop to render the same. again effective to engage the end of the needle when the needle passes out of cooperative relation to said grindin element. r

2. A grinding machine for hypodermic needles and the like, comprising a rotatable turret, a holder carried by said turret for holding the needle to be ground, means whereby said holder supports needles of various lengths with the ends to be ground in constant relationto the grinding element, said means comprising a pivoted stop in predetermined relation to said holder and adapted to engage the end of the Also, e

needle to be ground, means including a cam adaptedto engage said stop to move the same out of engagement with the end of the needle to be ground while the needle is in cooperative relation to said grinding element and to release said stop to render the same again efiective to engage the end of the needle when the needle passes out of cooperative relation to said grinding element, and means adapted to engage said holder after the needle, passes out of cooperative relation to said grinding element for releasing said needle.

3. A grinding machine for hypodermic needles and the like comprising a rotatable turret, a holder carried by said turret for holding the needle to be ground, a grinding element so positioned that rotation of said turret causes the needle. to traverse said element, means whereby said holder supports needles of various lengths with the ends to be ground in constant relation to the grinding element, said means comprising a stop carried by said turret in predetermined relation to the holder, said stop being movable. to effective and ineffective positions, means fornormally holding said stop in effective position in engagement with the end of the needle to be ground, and stationary means adapted to engage said stop to move it to inefiective position while the needle is in cooperative relation to said grinding element. c

4. A grinding machine for hypodermic needles and the like comprising a rotatable turret, a holder carried by said turret for holding the needle to be ground, a grinding element so positioned that rotation of said turret causes the needle to traverse said element, means whereby said holder supports needles of various lengths with the ends to be ground in constant relation to the grinding element, said means comprising a stop carried by said turret in predetermined relation to the holder, said stop being movable to effective and ineffective positions, means fornormally holding said stop in effective position in engagement with the end of the needle to be ground, stationary means adapted to engage said stop to move it to ineffective position while the needle is in cooperative relation to said grinding element, and means adapted to engage said holder after theneedle passes out of :cooperative relation to said grinding element for releasing said needle.

ALBERT D. MIZZY; 

